Malicious PDF — malware analysis report

Static analysis result for SHA-256 98fc61ee65c65a81…

MALICIOUS

PDF

46.5 KB Created: 2021-09-13 09:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0abfb786d34e4a6dbb6a239be576ce38 SHA-1: bf3157dc9033a1a7deccf21d91beb5ee140558d6 SHA-256: 98fc61ee65c65a81d02ec3f41b842e05cb6f394a6135559af46ffd0960c220f6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. Heuristics identified it as a link farm hosted on compromised CMS uploads and disposable hosting, with numerous embedded URLs pointing to potentially malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6210

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://anukulagrotech.com/userfiles/file/31338278915.pdf In PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc0e11ccea---nisuxo.pdfIn PDF document text
    • https://reha.bg/content/upload/file/90328017260.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/xabafizosugidel.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/9124854675.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109130630508538.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/wotigetunaleg.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/roxel.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/31139116148.pdfIn PDF document text
    • http://rnralpha.cz/res/file/buxito.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/24266993851.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/wavakadifovowigopekoz.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/8i2phf2rte5lvlq9r516r3cpi4/penezawuxanikosorobisut.pdfIn PDF document text
    • https://medtek.vn/storage/file/naxefiwaxedel.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612edf613864d---zoxab.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021922310153637.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/sujixifedariro.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/fb6b1a5e95f8ea1ccc8c9aa64c71c8fd/paroxeg.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/23841112849.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/10952341079.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/xovutofojitujilude.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/65294406149.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/48533737884.pdfIn PDF document text
    • https://farsiherbal.com/cache/fck_files/file/kudaxakuzobevegiseluwamit.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/d9825ac7807a455634ddb9e21cb3a846/repelimijidasudenat.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/36414599301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=screen+size+on+note+8PDF link annotation

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